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Quantification of patellar tracking using kinematic MRI

C M Powers1, F G Shellock, M Pfaff

  • 1Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles 90033, USA.

Journal of Magnetic Resonance Imaging : JMRI
|June 17, 1998
PubMed
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This study introduces a new method using kinematic MRI (KMRI) to measure dynamic patellar tracking. Normal knee extension shows specific patellar movements, offering insights for patellofemoral pain research.

Area of Science:

  • Biomedical Engineering
  • Radiology
  • Orthopedics

Background:

  • Patellofemoral pain is a common condition.
  • Accurate quantification of patellar tracking is crucial for understanding its biomechanics.
  • Existing methods may not fully capture dynamic patellar motion.

Purpose of the Study:

  • To describe a novel method for quantifying dynamic patellar tracking.
  • To utilize kinematic MRI (KMRI) for in-vivo assessment of patellar motion.
  • To establish baseline patellar tracking parameters in healthy individuals.

Main Methods:

  • Kinematic MRI (KMRI) was employed on a 1.5-T/64-MHz system.
  • A specialized device enabled active knee extension against resistance (15% body weight).
  • Images captured patellar position at 6 distinct flexion angles during 9°/sec extension.

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Main Results:

  • Normal patellar tracking involved medial displacement from 45° to 18° flexion, then lateral displacement.
  • Patellar tilt decreased (became less lateral) with knee extension.
  • Sulcus angle indicated superior patellar movement in the trochlear groove during extension.

Conclusions:

  • The described KMRI method effectively quantifies dynamic patellar tracking.
  • Established normal patellar motion patterns provide a benchmark for comparison.
  • Findings contribute to understanding patellofemoral joint biomechanics and informing clinical assessment.